治疗老年性干燥症的常用制剂有：保湿软膏、素软膏和尿素软膏。

Common agents for the treatment of senile xerosis are moisturizing ointments or ointments containing steroids and urea.

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锌盐是微量元素的常用制剂，治疗范围广，疗效确切，生物学功能作用独特。

Zinc is a trace element used commonly in preparation. It has an extensive use in curing with effective results and unique biological function.

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因此，尿素软膏，作为被认可的用于老年性干燥症的常用制剂，被选为对照药物用于评估喜疗妥的疗效。

Therefore a urea - containing ointment, established and approved in the treatment of senile xerosis was chosen as a comparator to evaluate the efficacy of hirudoid.

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